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iPhone Does dark mode reduce battery drain?

DaveOP

macrumors 68000
May 29, 2011
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Portland, OR
Kind of hoping it adds to the runtime.
After running the betas all summer, it didn't feel noticable. Obviously, Betas are not always battery optimized so that's not a super great test. I suspect it won't be substantial unless you're the type to check screen-on time in settings.
 
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dannyyankou

macrumors G3
Mar 2, 2012
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Westchester, NY
It does if done right. If it’s true black, where the pixels are turned off, it does.

But if it does what some apps are doing (and this forum lol) where it’s dark grey, it won’t reduce battery drain.
 
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phillytim

macrumors 65816
Aug 12, 2011
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Philadelphia, PA
Dark mode WILL save energy on OLED screens (X, XS, 11 Pros).

Dark mode WILL NOT save energy on LCD screens (most everywhere else).
 
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zorinlynx

macrumors 603
May 31, 2007
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9,885
Florida, USA
It does if done right. If it’s true black, where the pixels are turned off, it does.

But if it does what some apps are doing (and this forum lol) where it’s dark grey, it won’t reduce battery drain.

That doesn't make sense. Surely an OLED pixel displaying dark grey will use less energy than one displaying white?
 
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dannyyankou

macrumors G3
Mar 2, 2012
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Westchester, NY
That doesn't make sense. Surely an OLED pixel displaying dark grey will use less energy than one displaying white?
I don’t think that’s the case. When they say “true black”, they mean individual pixels are switched off. If pixels are lit grey, they’re still on and will use energy. Not sure if it’s less energy than white pixels, but if you want to save battery it should be “true black”.
 
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d.steve

macrumors 6502
Jan 6, 2012
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So yeah, it does require energy to make an LCD/LED pixel dark, so a dark pixel requires (more) energy.

However, you have to also consider the energy that goes into any backlighting. Dark mode on screens where backlighting is dynamic is better where the backlighting is more energy intensive than the sum of all dark pixels.
 
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Wilson1313

macrumors regular
Nov 29, 2008
104
190
There had been some tests on this, and OLED screens definitely do save power using black text. For an LCD screen, the backlight has to be always on regardless if there are black pixels on the display (black is essentially just achieved by putting a filter over the backlight). For OLED, each pixel is independently controlled so a majority black screen will have the pixels either off or at very low power.

 
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Vivian125

macrumors 6502
May 19, 2017
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Enabling dark mode actually drains battery on OLED Screen.. and even more on LCD since it is Feature enabled hence making the hardware to use more effort. And no it doesnt save battery, and it even drains by a lot lot
 
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C DM

macrumors Sandy Bridge
Oct 17, 2011
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Enabling dark mode actually drains battery on OLED Screen.. and even more on LCD since it is Feature enabled hence making the hardware to use more effort. And no it doesnt save battery, and it even drains by a lot lot
That's not how enabling or disabling something works, simply based on it being an option.
 
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phillytim

macrumors 65816
Aug 12, 2011
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Philadelphia, PA
Enabling dark mode actually drains battery on OLED Screen.. and even more on LCD since it is Feature enabled hence making the hardware to use more effort. And no it doesnt save battery, and it even drains by a lot lot
Completely wrong. Even if there was a shred of truth to that, the fact that the amount of OLED pixels not being lit up in dark mode would save a multitude more battery power in comparison.
 
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